Size-controlled self-assembly of superparamagnetic polymersomes.
Size-controlled self-assembly of superparamagnetic polymersomes.
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DOI：
10.1021/nn405012h
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发表时间：
2014-01-28
期刊：
影响因子：
17.1
通讯作者：
Park SJ
中科院分区：
文献类型：
--
作者：
Hickey RJ;Koski J;Meng X;Riggleman RA;Zhang P;Park SJ
我们报道了通过纳米粒子和两亲性聚合物的合作自组装来控制聚合体的尺寸。用不同大小的氧化铁纳米颗粒制备了磁性纳米颗粒密集包裹在聚合物膜中的聚合体（磁性聚合体）。纳米粒子在聚合体膜中的分布与大小有关；当小的纳米颗粒分散在聚合物双层膜中时，大颗粒在双层膜的内层和外层之间的界面处形成有序的上层结构。磁性聚合体的产率随着纳米颗粒直径的增加而增加。此外，聚合体的大小可以通过改变纳米颗粒的大小来有效控制。这种尺寸依赖的自组装归因于聚合物链熵效应和聚合物双层中纳米颗粒的尺寸依赖定位。磁性聚合体的横向弛豫率（r2）随着纳米颗粒直径的增大和聚合体尺寸的减小而增大，在241±16 nm的聚合体中达到555±24 s−1mM−1，这是迄今为止报道的超顺磁性氧化铁纳米颗粒的最高值。
We report the size-controlled self-assembly of polymersomes through the cooperative self-assembly of nanoparticles and amphiphilic polymers. Polymersomes densely packed with magnetic nanoparticles in the polymersome membrane (magneto-polymersome) were fabricated with a series of different sized iron oxide nanoparticles. The distribution of nanoparticles in a polymersome membrane was size-dependent; while small nanoparticles were dispersed in a polymer bilayer, large particles formed well-ordered superstructure at the interface between the inner and outer layer of a bilayer membrane. The yield of magneto-polymersomes increased with increasing the diameter of incorporated nanoparticles. Moreover, the size of polymersomes was effectively controlled by varying the size of incorporated nanoparticles. This size-dependent self-assembly was attributed to the polymer chain entropy effect and the size-dependent localization of nanoparticles in polymersome bilayers. The transverse relaxation rates (r2) of magneto-polymersomes increased with increasing the nanoparticle diameter and decreasing the size of polymersomes, reaching 555 ± 24 s−1mM−1 for 241 ± 16 nm polymersomes, which is the highest value reported to date for superparamagnetic iron oxide nanoparticles.
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DOI：
10.1021/jz200640x
发表时间：
2011-07-07
期刊：
The journal of physical chemistry letters
影响因子：
--
作者：
Kamat NP;Katz JS;Hammer DA
通讯作者：
Hammer DA
影响因子：
3.9
作者：
Lorenceau, E;Utada, AS;Weitz, DA
通讯作者：
Weitz, DA
影响因子：
10.8
作者：
Lee, Nohyun;Choi, Yoonseok;Hyeon, Taeghwan
通讯作者：
Hyeon, Taeghwan
影响因子：
3
作者：
Kremer, JR;Mastronarde, DN;McIntosh, JR
通讯作者：
McIntosh, JR
影响因子：
5.5
作者：
Hayward, Ryan C.;Pochan, Darrin J.
通讯作者：
Pochan, Darrin J.